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ISE Eiffel includes EiffelStudio and Envision, proprietary software products of Eiffel Software (a business name of Interactive Software Engineering Inc.).
There is also a free (libre) open source edition of EiffelStudio.
Latest release: 2006-10-25
Eiffel for OS X is a proprietary product having its origins in Eiffel/S 2.0 from Object Tools GmbH. It has been adapted and enhanced by Ian Joyner of Harmonic Systems to support Mac OS X.
Latest release: 2005-12-18
Visual Eiffel is a product of Object Tools GmbH (formerly SIG Computer GmbH), available in open source and proprietary (Enterprise) versions.
Latest release: 2005-06-28